A5083714165- Arsenic contamination and mitigation
- Mine drainage and remediation techniques
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Heavy metals in environment
- Groundwater and Isotope Geochemistry
- Soil and Unsaturated Flow
- Heavy Metal Exposure and Toxicity
- Soil Carbon and Nitrogen Dynamics
- Geochemistry and Geologic Mapping
- Water resources management and optimization
- Soil erosion and sediment transport
- Iron oxide chemistry and applications
- Geology and Paleoclimatology Research
- Metal Extraction and Bioleaching
- Wastewater Treatment and Nitrogen Removal
- Geochemistry and Elemental Analysis
- Landslides and related hazards
- Rangeland and Wildlife Management
- Water Quality and Pollution Assessment
- Water-Energy-Food Nexus Studies
- Environmental remediation with nanomaterials
- Tailings Management and Properties
- Atmospheric aerosols and clouds
Boise State University
2014-2023
Oak Ridge National Laboratory
2009
Stanford University
2002-2005
Nevada System of Higher Education
2004
Desert Research Institute
2004
University of Waterloo
1998-2002
Natural Resources Canada
1999
Colorado College
1997
The University of Texas at Austin
1996
University of Montana
1994
Owing to its high surface area and intrinsic reactivity, ferrihydrite serves as a dominant sink for numerous metals nutrients in environments is potentially important terminal electron acceptor microbial respiration. Introduction of Fe(II), by reductive dissolution Fe(III) minerals, example, converts Fe phases varying their retention reducing capacity. While Fe(II) concentration the master variable dictating secondary mineralization pathways ferrihydrite, here we reveal that kinetics...
A permeable reactive barrier, designed to remove metals and generate alkalinity by promoting sulfate reduction metal sulfide precipitation, was installed in August 1995 into an aquifer containing effluent from mine tailings. Passage of groundwater through the barrier results striking improvement water quality. Dramatic changes concentrations SO4 (decrease 2000−3000 mg/L), Fe 270−1300 trace (e.g., Ni decreases 30 (increase 800−2700 mg/L) are observed. Populations reducing bacteria 10 000...
Abstract Many catchment hydrologic and ecologic processes are impacted by the storage capacity of soil water, which is dictated profile thickness water retention properties soil. Soil primarily controlled texture, in turn varies spatially response to microclimate‐induced differences insolation, wetness temperature. All these variables can be strongly differentiated slope aspect. In this study, we compare quantitative measures for two opposing slopes a semi‐arid southwest Idaho, USA....
Iron cycling and the associated changes in solid phase have dramatic implications for trace element mobility bioavailability. Here we explore formation of secondary iron phases during microbially mediated reductive dissolution ferrihydrite-coated sand under dynamic flow conditions. An initial period (10 d) rapid reduction, indicated by consumption lactate production acetate Fe(II) to pore water association with a darkening column material, is followed much lower rate reduction termination...
Abstract The generation and release of acidic drainage containing high concentrations dissolved metals from decommissioned mine wastes is an environmental problem international scale. A potential solution to many acid problems the installation permeable reactive walls into aquifers affected by water derived waste materials. wall installed aquifer impacted low‐quality waters was in August 1995 at Nickel Rim site near Sudbury, Ontario. mixture, organic matter, designed promote bacterially...
Consumption of groundwater containing >10 μg L–1 arsenic (As) adversely impacts more than 100 million people worldwide. Multiyear trends in aquifer As concentrations have been documented, but strong seasonal variations are not commonly observed. Here we report dramatic changes and chemistry within the Jianghan Plain Yangtze River, China. At some wells, fluctuate by an order magnitude a single year (100–1200 L–1). Groundwater extraction sustained water levels surface channels during dry...
Abstract Lateral downslope flow in snow during snowmelt and rain‐on‐snow (ROS) events is a well‐known phenomenon, yet its relevance to water redistribution at hillslope catchment scales not well understood. We used dye tracers, geophysical methods, hydrometric measurements describe the properties that promote lateral flow, assess relative velocities of soil, estimate volumes flow. Results demonstrate rain melt can travel tens metres along layers within snowpack or base hours. becomes less...
Historical storage of ore concentrate containing sulfide minerals at an industrial site in British Columbia, Canada, has resulted widespread contamination the underlying soil and ground water. The oxidation released significant quantities heavy metals, including Cu, Cd, Co, Ni, Zn, into A pilot-scale, compost-based, sulfate-reducing permeable reactive barrier was installed path dissolved heavy-metal plume. uses bacteria to promote precipitation metals as insoluble metal sulfides. Monitoring...
Abstract In the western United States, mountain snowpack is an important natural reservoir that extends spring and summer water delivery to downstream users ecosystems. The importance of winter snow accumulation upland ecosystems not as clearly defined. This study investigates relative contribution precipitation soil moisture storage availability in a semi‐arid mountainous watershed. At this site, coarse textures shallow depths limit capacity 6–16 cm. Winter exceeds by 2.5 times....
The magnitude and mechanisms of nitrous oxide (N2O) release from rivers streams are actively debated. complex interactions hydrodynamic biogeochemical controls on emissions this important greenhouse gas preclude prediction when where N2O will be significant. We present observations column large-scale flume experiments supporting an integrative model stream sediments. Our results show a distinct, replicable, pattern generation consumption dictated by subsurface (hyporheic) residence times...
Desert pavements are prominent features in arid environments and consist of a surface layer closely packed gravel that overlies thin, gravel‐poor, vesicular A (Av) soil horizon. Well‐developed Av horizons form distinct highly structured columnar peds. These structures, along with their silt‐ clay‐rich texture, hypothesized as controlling infiltration hence the overall hydrologic conditions profile. The objectives this study were to (i) evaluate how pedological development near‐surface an...